I have some Olypus lenses that were used with my OM20 camera that I would like to use on my Pentax K-r camera. Is this possible, and what would I need to do it?
Does anybody know the throat diameter of Argus SLR bayonet mount? I know its flange focal distance (register) is 44.45mm, but I don't know the diameter of the mount. Specifically, I'm interested to ...